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kill off

B1 neutral separable transitive
In simple words

To get rid of something or someone completely, or to destroy a group one by one.

Meanings

1 B1 idiomatic neutral

To cause the death or extinction of a group of animals, plants, or people.

"Pollution has killed off nearly all the fish in that stretch of the river."

Grammar: separable
2 B1 idiomatic informal

In fiction, to end a character's life in a story, show, or book.

"The writers decided to kill off the main villain in the season finale."

Grammar: separable
3 B2 idiomatic neutral

To gradually end or eliminate a business, idea, habit, or trend.

"The rise of digital streaming has killed off the market for physical music stores."

Grammar: separable
Usage notes

Very widely used in ecology (species killed off), fiction (writers killing off characters), business (products or companies), and history. Has a deliberate or progressive feel compared to 'wipe out'. Frequently used metaphorically.

Commonly used with

species character competition bacteria industry rival population

Forms

Base
kill off
I/you/we/they
3rd person
kills off
he/she/it
Past simple
killed off
yesterday
Past participle
killed off
have + pp
-ing form
killing off
continuous

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Synonyms

eliminate wipe out eradicate destroy get rid of finish off

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